//
// Created by WuShiHai on 23/11/2016.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[]){

    int sock;
    char mesasge[BUF_SIZE];
    int str_len = 0;
    struct sockaddr_in serv_addr;

    if (argc != 3 ){
        printf("Usage : %s <IP> <port>\n",argv[0]);
        exit(1);
    }

    sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (sock == -1){
        error_handling("socket() error");
    }

    memset(&serv_addr, 0 , sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr  = inet_addr(argv[1]);
    serv_addr.sin_port = htons(atoi(argv[2]));

    if (connect(sock, (struct sockadd*)&serv_addr, sizeof(serv_addr)) == -1){
        error_handling("connect() error!");
    }


    while (1){
        fputs("Input message(Q to quit): ",stdout);
        fgets(mesasge,BUF_SIZE,stdin);

        if (!strcmp(mesasge,"q\n") || !strcmp(mesasge,"Q\n")){
            break;
        }

        write(sock,mesasge,strlen(mesasge));
        str_len=read(sock,mesasge,BUF_SIZE-1);
        mesasge[str_len]=0;
        printf("Message from server: %s", mesasge);
    }

    close(sock);

    return 0;
}

void  error_handling(char *message){
    fputs(message, stderr);
    fputc('\n',stderr);
    exit(1);
}